<template>
  <el-container class="home-container">
  <!--头部区域-->
  <el-header>
  <div>
  <img src="" alt="">
  <span>电商后台管理系统</span>
  </div>
  <el-button type="info" @click="logout">退出</el-button>
  </el-header>
  <!--页面主体区域-->
  <el-container>
    <!--侧边栏-->
    <el-aside :width="isCollapse ? '64px' : '200px'">
    <div class="toggle-button" @click="toggleCollapse">|||</div>
    <!--侧边栏菜单区域-->
    <el-menu
      background-color="#333744"
      text-color="#fff"
      active-text-color="#409EFF"
      unique-opened :collapse="isCollapse"
      :collapse-transition="false" router
      :default-active="activePath">
      <!--一级菜单-->
      <el-submenu :index="item.id+''" v-for="item in menulist" :key="item.id">
        <!-- 一级菜单的模板区域 -->
        <template slot="title">
          <!-- 图标 -->
          <i class="el-icon-location"></i>
          <!-- 文本 -->
          <span>{{item.authName}}</span>
        </template>
        <!-- 二级菜单的模板区域 -->
        <el-menu-item :index="'/' + subItem.path" v-for="subItem in item.children" :key="subItem.id"
        @click="saveNavState('/' + subItem.path)">
        <template slot="title">
          <!-- 图标 -->
          <i class="el-icon-menu"></i>
          <!-- 文本 -->
          <span>{{subItem.authName}}</span>
        </template>
        </el-menu-item>
        
      </el-submenu>
     
    </el-menu>
    </el-aside>
    <!--右侧内容主体-->
    <el-main>
      <!--路由占位符-->
      <router-view></router-view>
    </el-main>
  </el-container>
</el-container>
</template>

<script>
export default {
  data() {
     return{
       //左侧菜单数据
       menulist: [],
       //是否折叠
     isCollapse: false,
     //被激活的链接地址
     activePath: ''
     }
  },
  created(){
    this.getMenuList()
    this.activePath = window.sessionStorage.getItem('activePath')
  },
  methods: {
    logout() {
      window.sessionStorage.clear()
      this.$router.push('/login')
    },
    //获取所有的菜单
    async getMenuList() {
       const {data: res} = await this.$http.get('menus')
       if(res.meta.status !== 200)return this.$message.error(res.meta.msg)
       this.menulist=res.data
       console.log(res)
    },
    //点击按钮，切换菜单的折叠与展开
    toggleCollapse(){
      this.isCollapse = !this.isCollapse
    },
    //保存链接的激活状态
    saveNavState(activePath){
      window.sessionStorage.setItem('activePath',activePath)
      this.activePath=activePath
    }
  },
}
</script>

<style lang="less" scoped>
.home-container{
  height:100%;
}
.el-header{
  background-color: #373d41;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color:#fff;
  font-size:20;
  > div {
    display: flex;
    align-items:center;
    span{
      margin-left: 15px;
    }
  }
}
.el-aside{
  background-color: #333744;
  .el-menu{
    border-right:none;
  }
}
.el-main{
  background-color:#EAEDF1
}

.toggle-button {
  background-color: #4A5064;
  font-size: 10px;
  line-height:24px;
  color:#fff;
  text-align:center;
  letter-spacing: 0.2em;
  cursor:pointer;
}
</style>
